Ultrasonic Leak Detector Ultrasound leak detection covers a wide range of leaks: pressure or vacuum and any gas. Sound dependent, ultrasound instruments detect turbulent flow produced as the fluid (liquid or gas) moves from the high-pressure side to the low-pressure side of a leak. Ultrasound leak inspection is especially beneficial in areas where there is a saturation of gases or where a wide variety of gases, pressurized vessels and vacuum processes exist. For this reason ultrasound leak detection is used in many facilities for safety, environmental, energy or quality assurance programs